<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>垂直压力布局</title>
  <link rel="stylesheet" href="css/flex02.css">
</head>

<body>

  <div class="flex-box box01 border-box01">
    <div class="border-box">111</div>
    <div class="border-box">222</div>
    <div class="border-box">333</div>
  </div>
  <hr>
  <div class="flex-box box02 border-box01">
    <div class="border-box">111</div>
    <div class="border-box">222</div>
    <div class="border-box">333</div>

  </div>

  <div class="fixed-box">固定定位元素</div>
</body>

</html>